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Re: tar does not support partial reads

From: Petr Pisar
Subject: Re: tar does not support partial reads
Date: Tue, 20 Jul 2021 08:27:45 +0200

V Mon, Jul 19, 2021 at 03:39:53PM -0500, Paul Eggert napsal(a):
> On 7/19/21 7:54 AM, Christian Schoenebeck wrote:
> > POSIX compliant applications must always expect that read() /
> > write() functions might read/write less bytes than requested
> Although that's true in general, it's not true for regular files. The 
> POSIX spec for 'read' 
> <https://pubs.opengroup.org/onlinepubs/9699919799/functions/pread.html> 
> says, "The value returned may be less than /nbyte/ if the number of 
> bytes left in the file is less than /nbyte/, if the /read/() request was 
> interrupted by a signal, or if the file is a pipe or FIFO or special 
> file and has fewer than /nbyte/ bytes immediately available for reading."
> So, regular files shouldn't get short reads unless there's an EOF or a 
> signal.
What does gaurantee there is no signal sent to the process?

-- Petr

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